[RFT] BCM4312 users with DMA errors, please test!

[Gábor Stefanik]

Hello Everyone!

If you are experiencing DMA errors on a BCM4312, please test the
attached patch. It implements the PCI-E SERDES workaround, which the
hybrid driver is applying during early init to LP-PHY cards, and which
is a good candidate for the cause of the DMA error.
Note that this is not a final patch & it may cause collateral damage
for non-4312 cards; if it helps the 4312 problem, I will submit a
cleaned-up version.

Thanks,
Gábor
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